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- 摘要
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- 实验方案
- 产品
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Printed Higha??Density and Flexible Photodetector Arrays via Sizea??matched Heterogeneous Microa??/Nanostructure
摘要： Semiconductor/metal binary systems constitute the core components in electronic/photonic devices. The domain size of the heterostructure should be comparable to the charge diffusion length for superior photoelectric response. However, the fabrication of size-matched heterostructures is still a challenge, especially for printed devices. Here, a high-density photodetector array with lateral semiconductor/metal heterostructure is achieved via the template-assisted sequentially printing strategy. The Ag/PBDB-T:ITIC/Ag based lateral heterojunction that matches the charge diffusion length in the charge transfer process provides high light response sensitivity (D* = 3.41 × 1012 Jones, R = 12.9 A W?1). Moreover, the printed pixel interval can be decreased to 10 μm (106 pixels cm?2; resolution: 2.5 × 103 dpi). As the printing strategy can be implemented on soft substrates, the photodetector arrays are endowed with the flexibility. This work demonstrates a simple and effective strategy for chip-scale fabrication of flexible high-performance photodetectors, which validates the potential of printed heterogeneous micro-/nanostructures for integrated active electronics and optics.
关键词： flexible photodetector arrays,light imaging,sequential printing,heterostructures
更新于2025-09-23 15:21:01
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[ASME ASME 2018 13th International Manufacturing Science and Engineering Conference - College Station, Texas, USA (Monday 18 June 2018)] Volume 1: Additive Manufacturing; Bio and Sustainable Manufacturing - High-Throughput 3D Printing of Customized Imaging Lenses
摘要： The emerging 3D printing technology has the potential to transform manufacturing customized optical elements, which currently heavily relies on the time-consuming and costly polishing and grinding processes. However, the inherent speed-accuracy trade-off seriously constraints the practical applications of 3D printing technology in optical realm. In addressing this issue, here, we report a new method featuring a significantly faster fabrication speed, at 24.54 mm3/h, without compromising the fabrication accuracy or surface finish required to 3D-print customized optical components. We demonstrated a high-speed 3D printing process with deep subwavelength (sub-10 nm) surface roughness by employing the projection micro-stereolithography process and the synergistic effects from the grayscale photopolymerization and the meniscus equilibrium post-curing methods. Fabricating a customized aspheric lens with 5 mm in height and 3 mm in diameter could be accomplished in less than four hours. The 3D-printed singlet aspheric lens demonstrated a maximal imaging resolution of 2.19 μm with low field distortion less than 0.13% across a 2-mm field of view. This work demonstrates the potential of 3D printing for rapid manufacturing of optical components.
关键词： optical lenses,meniscus equilibrium post-curing,projection micro-stereolithography,3D printing,grayscale photopolymerization
更新于2025-09-23 15:21:01
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Concurrent Formation of Metallic Glass During Laser Forward Transfer 3D Printing
摘要： In recent years, bulk metallic glasses (BMGs) have drawn much research attention and are shown to be of industrial interest due to their superior mechanical properties and resistance to corrosion. In spite of the interest in harnessing MG for microelectromechanical systems devices, there are limitations in manufacturing such micrometer-scale structures. A novel approach for the fabrication of 3D MG structures using laser-induced forward transfer (LIFT) is demonstrated. Inherent tremendous cooling rates associated with the metal LIFT process (≈1010 k s?1) make the formation of a variety of BMGs accessible, including also various binary compositions. In this work, it is demonstrated that LIFT printing of ZrPd-based metallic glass microstructures can also be performed under ambient conditions. X-ray diffraction analysis of the printed structures reveals > 95% of amorphous metal phase. Taking advantage of the properties of BMG, high quality printing of high aspect ratio BMG pillars, and microbridges are demonstrated. It is also shown how a composite, amorphous-crystalline metal structure with a required configuration can be fabricated using multimaterial LIFT printing. The inherent high resolution of the method combined with the noncontact and multimaterial printing capacity makes LIFT a valuable additive manufacturing technique to produce metallic glass-based devices.
关键词： mixed metal structures,3D metal printing,metal glass,additive manufacturing
更新于2025-09-23 15:21:01
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Fabrication of perovskite solar cell with high short-circuit current density (JSC) using moth-eye structure of SiOX
摘要： The performance of solar cells is determined by three factors: the open-circuit voltage (VOC), short-circuit current density (JSC), and fill factor (FF). The VOC and FF are determined by the material bandgap and the series/shunt resistance, respectively. However, JSC is determined by the amount of incident light in addition to the bandgap of the material. In this study, a moth-eye pattern was formed on a glass surface via direct printing to increase the amount of incident light and thus increase JSC. The moth-eye pattern is a typical antireflection pattern that reduces the reflection by gradually increasing the refractive index. A flat perovskite solar cell (F-PSC) and a moth-eye patterned perovskite solar cell (M-PSC) had JSC values of 23.70 and 25.50 mA/cm2, respectively. The power-conversion efficiencies of the F-PSC and M-PSC were 19.81% and 21.77%, respectively.
关键词： perovskite solar cells,hydrogen silsesquioxane,direct printing,moth-eye pattern
更新于2025-09-23 15:21:01
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Controllable tuning of Fabrya??Perot cavities <i>via</i> laser printing
摘要： The Fabry–Perot (FP) cavity is one of the basic optical components that has been widely applied in interferometry, spectroscopy, lasers and optoelectronic devices. Currently, tailorable FP cavities are highly desirable for fast and in situ modulation, which is crucial for optoelectronic devices and their integration. Here a simple tuning strategy of FP cavity mode is developed based on the plasmon-assisted laser printing technique. The laser irradiation induces photochemical and/or photothermal degradation of the polymer medium in the cavity, which is highly dependent on the film thickness and laser power. Thus, the FP cavity mode can be precisely and continuously tuned with irradiation time, which is then monitored using reflection spectra. Such a laser printing strategy is facile and general, which is capable of generating different structural colours.
关键词： laser printing,structural colours,plasmon-assisted,photochemical degradation,photothermal degradation,Fabry–Perot cavity
更新于2025-09-23 15:21:01
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Direct Patterning of Piezoelectric Thin Films by Inkjet Printing
摘要： Inkjet printing is currently gaining momentum as a low-cost and eco-friendly additive manufacturing technique for electronics. Patterning of functional metal oxide thin films on high surface energy substrates via inkjet printing remains a challenge and requires assistance from lithographic processes. This work unveils a novel process for lithography and etching-free patterning of lead zirconate titanate (PZT) films on pristine platinized silicon through the use of inkjet-printed alkanethiolate-based templates. The technique requires neither lithography nor etching, respectively, before and after PZT printing. The described process allows for feature sizes in the sub-100 μm range with control over the thickness of the final film. Inkjet-printed PZT displays typical ferroelectric and piezoelectric properties of solution-derived thin films, with remnant polarization 13 μC cm?2, coercive field 58 kV cm?1, permittivity 900, dielectric losses 0.07, and effective longitudinal piezoelectric coefficient 50 pm V?1.
关键词： piezoelectrics,lead zirconate titanate,inkjet printing,patterning,self-assembled monolayers
更新于2025-09-23 15:21:01
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Preliminary Characterization of Glass/Alumina Composite Using Laser Powder Bed Fusion (L-PBF) Additive Manufacturing
摘要： Powder bed fusion (PBF) additive manufacturing (AM) is currently used to produce high-efficiency, high-density, and high-performance products for a variety of applications. However, existing AM methods are applicable only to metal materials and not to high-melting-point ceramics. Here, we develop a composite material for PBF AM by adding Al2O3 to a glass material using laser melting. Al2O3 and a black pigment are added to a synthesized glass frit for improving the composite strength and increased laser-light absorption, respectively. Our sample analysis shows that the glass melts to form a composite when the mixture is laser-irradiated. To improve the sintering density, we heat-treat the sample at 750°C to synthesize a high-density glass frit composite. As per our X-ray diffraction (XRD) analysis to confirm the reactivity of the glass frit and Al2O3, we find that no reactions occur between glass and crystalline Al2O3. Moreover, we obtain a high sample density of ≥95% of the theoretical density. We also evaluate the composite’s mechanical properties as a function of the Al2O3 content. Our approach facilitates the manufacturing of ceramic 3D structures using glass materials through PBF AM and affords the benefits of reduced process cost, improved performance, newer functionalities, and increased value addition.
关键词： density,powder bed fusion,additive manufacturing,mechanical property,3D printing,glass/alumina composite
更新于2025-09-23 15:21:01
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Edge Enriched Self-assembly of Au Nanoparticles: Coffee-Ring Effect during Microcontact Printing via Agarose Stamps
摘要： Amino functionalized surfaces were selectively modified via the combination of a wet agarose stamping technique and microcontact printing technique. Because of the specific reaction environments and diffusion of HNO2 confined in agarose stamp, the reaction of amino groups in the edge of the strip pattern was much more intense than other areas. The modified amino groups in the edge areas show higher affinity to Au-NPs than other areas, consequently, edge enriched Au-NPs patterns were observed after the self-assembly of Au-NPs. A “cylindrical droplet” model, in a manner analogous to coffee-ring effect, was proposed to describe the diffusion of HNO2 from the bulk to the edge in agarose stamp. By using such density varied Au-NPs patterns as templates for the growth of ZnO nanorods, we observed high density of Au-NPs resulting in high density and highly (001) oriented ZnO nanorods. In contrast, sparse and non-oriented ZnO nanorods were grew on low density of Au-NPs areas. Our findings might open new routes for the fabrication of gradient patterns and extend applications of Au-NPs patterns in surface enhanced Raman scattering and catalysis.
关键词： coffee-ring effect,gradient patterns,microcontact printing,agarose stamp,self-assembly
更新于2025-09-23 15:21:01
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Shedding light on novel approach to artificial cornea
摘要： Arti?cial human corneas that could circumvent the problem of limited donors or ethical concerns have been developed by scientists at Newcastle University. These are the ?rst human corneas to have been 3D printed. The cornea is outermost, transparent layer of the eye, which covers the iris and pupil and plays a role in focusing light on to the retina. The team demonstrated a proof of principle experiment in which they have taken human corneal stromal cells from a healthy donor cornea, mixed them with alginate and collagen and created 3D bio printer ink. Using a conventional commercially available 3D bio-printer, they were able to extrude the mixture to form increasing concentric circles allowing them to fabricate an arti?cial human cornea from actual cells within ten minutes.
关键词： artificial cornea,hydrogel,tissue engineering,bio-ink,3D printing
更新于2025-09-23 15:21:01
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[IEEE SoutheastCon 2018 - St. Petersburg, FL, USA (2018.4.19-2018.4.22)] SoutheastCon 2018 - Measuring Ocular Counter Roll: THEIA Device
摘要： A novel prototype of a medical instrument for clinical diagnosis and research applications has been developed and tested. The device measures the ocular counter roll of an eyeball with a high level of precision using a mechanical measurement method (for head roll), and employs machine vision analysis to measure eye roll with respect to facial features. The prototype was 3D printed using an Objet 260 Polyjet 3D printer and tested in laboratory conditions.
关键词： Magnetic Encoder,Medical Device,Machine Vision,Ocular counter roll,3D printing
更新于2025-09-23 15:21:01